Object VisitDesignatorStatementDecrementoAST(designatorStatementDecrementoAST var, object arg)
{
int numaux = ((Integer)arg).intValue(); printtab(numaux); System.out.println(c.getClass().getName()); if(c.- !=null) c.-.visit(this,new Integer(numaux+1)); else{printtab(numaux+1); Console.WriteLine(“NULL”);} return null;
}
public statementAST parseStat()
{
//Statement
//case id
designatorAST desig = null;
exprAST expr = null;
actParsAST actP = null;
designatorStatementAumentoAST aum = null;
designatorStatementDecrementoAST decr = null;
Boolean actPBoo = false;
//case if
conditionAST condi = null;
statementAST stat = null;
statementAST stat2 = null;
Boolean elseBoo = false;
listStatementsAST tempStat,tempStat2, result;
exprAST forexpr1 = null;
conditionAST forexpr2 = null;
exprAST forexpr3 = null;
statementAST forstat = null;
switch (currentToken.sym)
{
case sym.ID:
{
desig=parseDesignator();
switch (currentToken.sym)
{
case sym.IGUAL:
{
acceptIt();
expr=parseExpr();
break;
}
case sym.P_ABI:
{
acceptIt();
if (currentToken.sym == sym.RES || currentToken.sym == sym.ID || currentToken.sym == sym.NUM || currentToken.sym == sym.CHARCONS || currentToken.sym == sym.TRUE || currentToken.sym == sym.FALSE || currentToken.sym == sym.NEW || currentToken.sym == sym.P_ABI)
{
actP=parseActPars();
actPBoo = true;
}
accept(sym.P_CER, ")");
break;
}
case sym.SUM_SUM:
{
aum = new designatorStatementAumentoAST();
acceptIt();
break;
}
case sym.IGU_IGU:
{
decr = new designatorStatementDecrementoAST();
acceptIt();
break;
}
accept(sym.PYCOMA, ";");
//Designator ( "=" Expr | "(" [ ActPars ] ")" | "++" | "--" ) ";"
}
if (expr != null)
{
return new designatorStatementAsignacionAST(expr);
}
else
if (actP != null)
{
return new designatorStatementUnActParsAST(actP); //revisar
}
else
if (actPBoo == true)
{
return new designatorStatementUnActParsAST(actP); //revisar
}
else
if (actPBoo==false) //analizar posible fallo
{
return new designatorStatementSinActParsAST();
}
break;
}
case sym.IF:
{
accept(sym.IF, "if");
accept(sym.P_ABI, "(");
condi=parseCondition();
accept(sym.P_CER, ")");
stat=parseStat();
//tempStat = new unStatementAST(stat);
if (currentToken.sym == sym.ELSE)
{
elseBoo=true;
stat2 = parseStat();
}
if (elseBoo == true)
{
return new ifStatementConELseAST (condi,stat,stat2);
}
else {
return new ifStatementSinELseAST(condi,stat);
}
break;
}
case sym.FOR:
{
accept(sym.FOR, "for");
accept(sym.P_ABI, "(");
forexpr1=parseExpr();
accept(sym.PYCOMA, ";");
if (currentToken.sym == sym.RES || currentToken.sym == sym.ID || currentToken.sym == sym.NUM || currentToken.sym == sym.CHARCONS || currentToken.sym == sym.TRUE || currentToken.sym == sym.FALSE || currentToken.sym == sym.NEW || currentToken.sym == sym.P_ABI)
{
forexpr2 = parseCondition();
}
accept(sym.PYCOMA, ";");
if (currentToken.sym == sym.RES || currentToken.sym == sym.ID || currentToken.sym == sym.NUM || currentToken.sym == sym.CHARCONS || currentToken.sym == sym.TRUE || currentToken.sym == sym.FALSE || currentToken.sym == sym.NEW || currentToken.sym == sym.P_ABI)
{
forexpr3=parseExpr();
}
accept(sym.PYCOMA, ";");
forstat=parseStat();
if(forexpr2!=null && forexpr3==null){
return new forStatementConConditionAST(forexpr1, forexpr2,forstat);
}
if (forexpr3 != null && forexpr2==null)
{
return new forStatementConFuntionAST(forexpr1, forexpr3, forstat);
}
if (forexpr3 == null && forexpr2==null)
{
return new forStatementSoloDeclAST(forexpr1, forstat);
}
if (forexpr3 != null && forexpr2!=null)
{
return new forStatementConCondFuntAST(forexpr1, forexpr2, forexpr3, forstat);
}
break;
}
case sym.WHILE:
{
accept(sym.WHILE, "WHILE");
accept(sym.P_ABI, "(");
condi = parseCondition();
accept(sym.P_CER, ")");
stat = parseStat();
return new whileStatementAST(condi,stat);
break;
}
case sym.BREAK: {
accept(sym.PYCOMA);
break;
}
case sym.RETURN:
{ Boolean ind=false;
acceptIt();
if (currentToken.sym == sym.RES || currentToken.sym == sym.ID || currentToken.sym == sym.NUM || currentToken.sym == sym.CHARCONS || currentToken.sym == sym.TRUE || currentToken.sym == sym.FALSE || currentToken.sym == sym.NEW || currentToken.sym == sym.P_ABI)
{
expr=parseExpr();
ind=true;
}
accept(sym.PYCOMA, ";");
if (ind == true)
{
return new returnStatementConExprAST(expr);
}
else {
return new returnStatementSinExprAST();
}
break;
}
case sym.READ:
{
acceptIt();
accept(sym.P_ABI, "(");
desig=parseDesignator();
accept(sym.P_CER, ")");
accept(sym.PYCOMA, ";");
return new readStatementAST(desig); //revisar este return
break;
}
case sym.WRITE:
{
accept(sym.P_ABI, "(");
expr=parseExpr();
Symbol tempsimbol=null;
if (currentToken.sym == sym.COMA)
{
accept(sym.COMA, ",");
tempsimbol=currentToken;
accept(sym.NUM, "number");
}
accept(sym.P_CER, ")");
accept(sym.PYCOMA, ";");
if (tempsimbol != null)
{
return new writeStatementConNumAST(tempsimbol, expr);
}
else
{
return new writeStatementSinNumAST(expr);
}
// "write" "(" Expr [ "," number ] ")" ";"
}
case sym.COR_A:
{
parseBlock();
break;
}
case sym.PYCOMA:
{
acceptIt();
break;
}
}
return null;
}
